Honda CB125 CB160 (1972) [53/139] Refer to fig 3 134

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3 13 CARBURETOR Fig 3 133 Sectional view of carburetor A Description of carburetor 1 Main system Air from the air cleaner is fed from the intake through the throttle valve and main bore and is sucked into the engine By this air flow a negative pressure is produced at the needle jet and the fuel of the float chamber passes through the main jet and enters the needle jet holder It then passes through the air jet and is mixed with the air entering through the hole around the needle jet holder passing through the clearance between the needle jet and the needle and under the throttle valve Here it is mixed with the air and turned into vapor for engine intake Refer to Fig 3 134 2 Slow speed system Pilot system The air from the intake passes outside the air screw it is adjusted by the air screw It enters the slow speed jet from the hole of the slow speed jet and is mixed with fuel coming from the fuel hole at the lower part of the slow speed jet becoming a densely mixed gas The mixture passes to the bottom of the throttle valve and is mixed with the main air from the intake for engine intake Adjustment of the the mixture ratio of the slow speed system is generally obtained by adjusting the air screw a heavy mixture by turning clockwise and a thin mixture by turning counter clockwise When a wide range adjustment is required the slow speed jet should be changed obtaining a heavy mixture by a larger number and a thin mixture by a smaller number Refer to Fig 3 135 47

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